Distinct transduction mechanisms of cyclooxygenase 2 gene activation in tumour cells after photodynamic therapy

Cedric Volanti, Nico Hendrickx, Johan Van Lint, Jean-Yves Matroule, Patrizia Agostinis, Jacques Piette

Research output: Contribution to journalArticlepeer-review

Abstract

Photodynamic therapy (PDT) is a minimally invasive treatment for cancer and several noncancerous proliferating cell diseases. PDT relies on the uptake of a photosensitizing compound by the pathologic tissue followed by a selective irradiation with visible light, which leads to oxidative stress-mediated cell death. However, some studies showed that PDT induces the release of proangiogenic factors, such as vascular endothelial growth factor, and/or cyclooxygenase-2 (COX-2), thereby promoting cancer cell regrowth following PDT. In this work, we focused on the molecular mechanisms regulating COX-2 expression after low-dose PDT in two cancer cell lines, namely HeLa and T24. We report that PDT induces COX-2 expression in these cells and this expression is mainly due to nuclear factor kappa B (NF-κB)-dependent transcription of cox-2 gene without any post-transcriptional regulation. However, the transduction mechanism leading to NF-κB activation and subsequent cox-2 gene transcription differs in both cell types. In T24, NF-κB activation occurs through a protein kinase C (PKC)α- and phosphoinositide-3-kinase (PI3K)-dependent I kappa B kinase (IKK) complex activation, whereas in HeLa cells, NF-κB activation is mediated by PKC- and PI3K-independent IKK complex activation.
Original languageEnglish
Pages (from-to)2981-2991
Number of pages11
JournalOncogene
Volume24
Issue number18
DOIs
Publication statusPublished - 21 Apr 2005
Externally publishedYes

Keywords

  • COX-2

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